N atural infections with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) in domestic animals living in infected households have been reported (1). Because of their increased popularity as a pet (2), domestic ferrets (Mustela putorius furo) pose a high risk for transmitting anthropozoonotic infections. A recent study in Spain showed that natural SARS-CoV-2 infections can occur in ferrets kept as working animals for rabbit hunting, especially if a high viral circulation is present in the human population (3). Further, ferrets are common laboratory animal models and, at least in experimental conditions, have been shown to be highly susceptible to SARS-CoV-2 infection and likely to transmit the virus to other ferrets without apparent clinical signs (4). The StudyOn November 20, 2020, a 5-year-old neutered male domestic ferret had signs of acute gastroenteritis, including apathy, anorexia, vomiting, and profuse mucous diarrhea. Another ferret in the same household appeared healthy. Because the ferret's condition did not improve, the owner took it to a veterinary hospital for clinical examination on November 23. The ferret was lethargic and, on the basis of skin turgor, was >5% dehydrated with low body temperature (36.4°C, reference range 37.8-40°C) and slow heart rate (180 beats/min, reference 200-400 beats/min). The body condition of the ferret was good, with a bodyweight of 1.3 kg. Several hematology and serum biochemistry results were elevated: red blood cell count (12.36 × 10 6 /µL, reference 7.01-9.65 × 10 6 /µL), hemoglobin concentration (21.2 g/dL, reference 12.2-16.5 g/dL), and hematocrit (0.57%, reference 0.36%-0.48%); blood urea nitrogen (>129.94 mg/dL, reference 18-32 mg/ dL), hyperproteinemia (8.5 g/dL, reference 4.5-6.2 g/ dL), hyperglobulinemia (4.4 g/dL, reference 2.8-3.6 g/dL), and borderline hyperalbuminemia (4.0 g/ dL, reference 2.5-4.0 g/dL) were consistent with dehydration and possible infection. The results of all other hematologic and biochemical values were within reference ranges. Whole-body radiographs (Appendix Figure, https://wwwnc.cdc.gov/EID/ article/27/9/21-0774-App1.pdf) showed splenomegaly and gas accumulation in intestinal loops. Interstitial and alveolar patterns of cranial lung lobes were present, indicating possible lobar pneumonia. The ferret was hospitalized and initially given fl uid therapy, amoxicillin, esomeprazole, maropitant, and dexamethasone. Three days later, the clinical status of the ferret improved, hematologic and biochemical values normalized, and the ferret was scheduled for discharge. However, on the same day, the owner informed the veterinary hospital of having positive results for SARS-CoV-2 RNA tested on November 24, after 9 days of malaise. Additional rectal and oropharyngeal swab specimens and blood samples were taken from the ferret for further diagnostic procedures, and the ferret was discharged from the hospital and put into isolation at the owner's home. Samples were not taken from the other pet ferret at the residence, but the rest of househo...

West Nile virus (WNV) is a flavivirus transmitted by mosquitoes. Birds are the reservoir for the virus; humans, horses and other mammals are dead-end hosts. Infections caused by WNV in humans can vary from asymptomatic infections to West Nile fever (WNF) or West Nile neuroinvasive disease (WNND). In 1995, a serosurvey was performed in Slovenia on forest workers, and WNV specific IgG antibodies were confirmed in 6.8% of the screened samples, indicating that WNV is circulating in Slovenia. No human disease cases were detected in Slovenia until 2013, when the first case of WNV infection was confirmed in a retrospective study in a 79-year old man with meningitis. In 2018, three patients with WNND were confirmed by laboratory tests, with detection of IgM antibodies in the cerebrospinal fluid of the patients. In one of the patients, WNV RNA was detected in the urine sample. In 2017, 2018 and 2019, a mosquito study was performed in Slovenia. Mosquitoes were sampled on 14 control locations and 35 additional locations in 2019. No WNV was detected in mosquitoes in 2017 and 2019, but we confirmed the virus in a pool of Culex sp. mosquitoes in 2018. The virus was successfully isolated, and complete genome sequence was acquired. The whole genome of the WNV was also sequenced from the patient’s urine sample. The whole genome sequences of the WNV virus detected in Slovenian patient and mosquito indicate the virus most likely spread from the north, because of the geographic proximity and because the sequences cluster with the Austrian and Hungarian sequences. A sentinel study was performed on dog sera samples, and we were able to confirm IgG antibodies in 1.8% and 4.3% of the samples in 2017 and 2018, respectively. Though Slovenia is not a highly endemic country for WNV, we have established that the virus circulates in Slovenia.

Monkeypox virus was imported into Finland during late May–early June 2022. Intrahost viral genome variation in a sample from 1 patient comprised a major variant with 3 lineage B.1.3–specific mutations and a minor variant with ancestral B.1 nucleotides. Results suggest either ongoing APOBEC3 enzyme–mediated evolution or co-infection.

A case of chikungunya virus infection was imported from Thailand into Slovenia in late 2018. The infection was diagnosed using real-time reverse transcription-PCR, the virus was isolated in cell culture, and the whole genome was sequenced. Phylogenetic analysis of the nearly complete viral genome indicated that the virus belongs to the Indian Ocean lineage but does not possess the A226V mutation in the envelope protein E1.

The clinical presentation of tick-borne encephalitis virus (TBEV) infection varies from asymptomatic to severe meningoencephalitis or meningoencephalomyelitis. The TBEV subtype has been suggested as one of the most important risk factors for disease severity, but TBEV genetic characterization is difficult. Infection is usually diagnosed in the post-viremic phase, and so relevant clinical samples of TBEV are extremely rare and, when present, are associated with low viral loads. To date, only two complete TBEV genomes sequenced directly from patient clinical samples are publicly available. The aim of this study was to develop novel protocols for the direct sequencing of the TBEV genome, enabling studies of viral genetic determinants that influence disease severity. We developed a novel oligonucleotide primer scheme for amplification of the complete TBEV genome. The primer set was tested on 21 clinical samples with various viral loads and collected over a 15-year period using the two most common sequencing platforms. The amplicon-based strategy was compared to direct shotgun sequencing. Using the novel primer set, we successfully obtained nearly complete TBEV genomes (>90% of genome) from all clinical samples, including those with extremely low viral loads. Comparison of consensus sequences of the TBEV genome generated using the novel amplicon-based strategy and shotgun sequencing showed no difference. We conclude that the novel primer set is a powerful tool for future studies on genetic determinants of TBEV that influence disease severity and will lead to a better understanding of TBE pathogenesis.